There are some issues that could lead the Brother printer is connected but not printing.
If your Brother printer is connected but still not printing, then make use of the troubleshooting methods given here.
To avoid paper jams, make sure you take necessary precautions before installing the paper in the paper tray.
First, try restarting your computer, printer and wireless router. To check if your printer is connected to your network: Print a Wireless Network Test report from the printer control panel. On many printers pressing the Wireless button allows direct access to printing this report.
The other most probable reason for the printing error is the connection between your computer and the printer. If you are sure that the transmission cable is working okay (tested the printer on another computer), then the problem might be the drivers. This can be the printer drivers or the USB port drivers.
Another common fail is over extrusion. Over extrusion happens when your 3D printer pushes out too much plastic too fast, causing a jam in the end of the nozzle. ... Make sure YOURu layer height is less than your nozzle diameter. Increase your cooling fan's power (this will cool the plastic and cause it to slow down)
WPS stands for Wi-Fi Protected Setup. It is a wireless network security standard that tries to make connections between a router and wireless devices faster and easier. WPS works only for wireless networks that use a password that is encrypted with the WPA Personal or WPA2 Personal security protocols.
To restore your HP printer to factory-default settings, follow these steps. Turn the product off. Disconnect the power cable from the product for 30 seconds and then reconnect. Turn the product on while you press and hold the Resume button for 10-20 seconds. The Attention light turns on. Release the Resume button.